Plastic bobbin



Allg- 3l, 1948. P. B. wlLsoN PLAsTlc BoBBIN Filed July 5, 1945 Patented Aug. 31,194s` vOFFICE ms'nc Bonnin Paul B. Wilson, Portland, reg., assignor to Harold D. Wolgamot, Portland, Oreg.

Application July 5, 1945, Serial No. 603,337

(Cl. 2lb-120) zclaiml.

This invention relates` to a bobbin. quill or cop for textile machinery and more especially to a bobbin, quill or cop made of plasticmaterial such as Tenlte which is cellulose aceto-butyrate, The object of the invention will hereinafter be referred to under the broad term 'bobbin." This bobbin is designed to overcome many of the imperfections and bad qualities of a wood bobbin universally heretofore employed in the textile trade such as in spinning frames and the like.

In wooden type Ibobblns having the three rings clamped therearound which are employed for enabling the bobbin to be held in a shuttle in an automatic loom, when the base of the bobbin cracks due to the fact that the bobbin is forced down over the tapering spindle in a spinning frame, the centrifugal force of the'spindle, running from fifteen to twenty thousand revolutions per minute in the spinning frame, will cause the base to spread, thereby losing friction and not give the required number of revolutions per minute,

thus resulting in the yarns not receiving the required number of twists per inch. In the present bobbinvthe solid metalic band which is disposed around the base of the bobbin has threecircular projections thereon to take the place ofthe conventional wire rings clamped around the wooden base of the bobbin and, therefore, prevents any expansion of the bobbin base.

Further, this metallic band being around the base of 'the bobbin and the plastic material being molded to the band thus embedding the band in and thus any wooden bobbin will `be out of balance on account of the fact that it is not perfectly round as varying resistances Vare offered the periphery of the bobbin base renders theband and itsrcircular projections thereon incapable of .shifting its position relative to thebase, and' therefore 'the bobbin will always aline itself when projected into' the shuttle so that the. tip of the bobbin will be at the same point relative to the eye of lthe shuttle at all times.

Furthermore, the steel rings which are clamped around the bases ofl wooden 'bobblns will slide around thebaseof thebobbln and, asis well known, these steel rings have a gap between their ends and -two and sometimes three of the gaps in these steel rings will be in alinement vertically of the bobbin and th'us will not properly hold the bobbin when' it is snapped into the shuttle and will allow its :point yto not be centered, with the eye of the shuttle. Also because of the diierence in the density of wood at various spots, it is impossible y*to make a really balanced bobbin which always-results in the bobbin being out of balance, which will cause it to shake loose from its frictional contact with the spindle resulting in defective yarn or requiring stoppage of the machine.

Furthermore, rbecause of the difference in the density of the various portions of a piece of wood out of which la quill or a bobbin is turned, it is impossible to make a perfectly round bobbin, that is, one which is a perfect circle in cross section,

by the wood to the cutting tool which cuts out the bobbin from a block of wood.

Furthermore, it is impossible -to make a perfectly round bore in the base of a wooden bobbin, because of the difference in density of the various spots of the wood, whereas in plastic this bevel can be perfectly molded, and will not wear unevenly like wood.

Furthermore, the salvage value of a plastic bobbin is quite an item as it can be remelted and remolded into a new bobbin, whereas a wooden bobbin must be discarded.

Because of the resilient nature of plastic material such -as Tenite, even when it is dented from abuse, within at most a day or so, the dent seems to have a tendency to fill back out and present -a smooth surface.

Furthermore, it is much harder to dent or damage than a. wooden bobbin and, even if dented to a point whereit will not return to its shape completely, there are no protruding fibers as in awood bobbin to catch the yarn being processed thereon.

A plastic being of uniform density throughout and molded in perfectly round cross section will always presen-t a balanced bobbin, the base will always properly grip the spindle and also, the bobbin is much harder to damage as to the surface thereof and will always present -a smooth surface for-receiving the yarn. Also, the metallic band. such as a. steel lband, which is embedded around the base -of the bobbin and the bobbin molded to the band does not provide any gap whatever for misalinement of the bobbin in lthe shuttle.

It is, therefore, an object of this invention to provide a bobbin mol-ded from plastic material such as cellulose aceto-butyrate, commonly known in the trade as Tenite.

It is another object of this invention to provide a bobbin molded from plastic material throughout and having a metallic ring with a plurality of separate projection-s around its base permitting yit to be used as a loom bobbin.

Some ofthe objects of the invention having been stated, other objects will appear as the description proceeds whenx taken in connection with the accompanying drawings in which:- biFigure l is side elevation of my improved bob- Figure 2 is a vertical sectional view through the bobbin:

Figure 3 is a. transverse sectional view substantially along the line 3-3 in Figure 1;

Figure 4 is a cross-sectional view taken along line 4-4 in Figure 1; f

Figure 5 is a vertical sectional view taken 3 through the lower portion of the bobbin and on an enlarged scale.

Referring more speciiically to the drawings the numeral I indicates the base portion of the bobbin while the numeral II indicates the barrel portion. This barrel has a plurality of grooves I2 therearound and a. plurality of inverted truncated portions I3 to provide the proper configuration for receivingthe yarn in a spinning frame and the like.

The entire base portion I0 and the barrel II is molded from a suitable plastic such as cellulose` aceto-butyrate commonly known in the trade as Tenite and manufactured by Tennessee Eastman Corporation.

The bobbin has a plurality of wires I4 extending from near one end to the other and around these wires is disposed a tubular woven metallic wire member I5. The woven wire tube I5 is disposed around the longitudinally extending wires I4 and then a suitable metallic ring I6 is disposed in the mold in the proper position and with the wires I4 and wire tube I5 and metallic ring I6 in position the plastic material is poured into the mold andthe same is molded under pressure to thereby provide a reinforced plastic bobbin with the entire inner and outer surfaces being of continuous plastic material and the only portion on the outer surface which is not of plastic material is the metallic ring i6 having the three raised circular projections I8 on its exterior for fitting into the bobbin holding mechanism in a shuttle.

The bobbin has a bore I9 extending from end to end, the lower end of the bore being larger than the upper end of the bore, it being stepped off as shown in the drawings, which is conventional in wooden bobbins. The lower end of the bore I9 is adapted to fit over a, beveled portion of a conventional spindle, whereby by frictional engagement with the spindle the bobbin will be driven by the spindle in a spinning frame and the like. The plastic material forms a. perfectly true circle in the lower end'of the bore for engaging the tapered portion of the spindle and therefore precludes any possibility of the bobbins coming loose on the spindle. Also, since the plastic material is uniform in density throughout, a perfectly balanced bobbin is provided which will run true at all times on the spindle even at high speed, and furthermore, the annular member I8 being molded into the plastic base cannot expand and allow the base to expand and thus decrease the frictional contact between the lower end of the bore I9 and the tapered portion of he spindle in the spinning frame.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a, generic and descriptive sense only, and not for purposes of limitation, the scope of the invention being defined in the claims.

I claim:

1. A bobbin molded from cellulose aceto-butyl'- ate and having reinforcing metallic members extending from one end of the bobbin to the other and completely embedded within the ce1- lulose aceto-butyrate and said reinforcing members being incased by a metallic tube of screen wire and the like, and the metallic tube and reinforcing wires extending longitudinally of the bobbin being completely embedded within the bobbin and not exposed to the interior or exterior surface of the bobbin.

2. A bobbin molded from plastic material and having reinforcing metallic members extending from one end of the bobbin to the other and completely embedded within the plastic material and said reinforcing members being incased by a metallic tube of screen wire and the like, and the metallic tube and reinforcing wires extending longitudinally of the bobbin being completely embedded within the bobbin and not exposed to the interior or exterior surface of the bobbin.

PAUL B. WIISON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Amrhein et al. June 26, 1945 

